I just did some copper on my Nightwretch, using Theirry\'s recipe, and it came out really close (I didn\'t have quite the same brown).
I used a base of Vallejo Flat Brown (984) and built up highlights by progressively adding Vallejo BasVallejo Basic Skin Tone (815). Thierry\'s recipe is to use Vallejo Red Leather (818) and build up to Basic Skin Tone.
I haven\'t tried his recipe for bronze, but it\'s probably spot-on: Vallejo Game Color Beasty Brown, Vallejo Ochre Maroon, Vallejo Dark Flesh, and finally Vallejo Ivory.
Cerridwyn1st has put together a list of all of Thierry\'s color recipes: http://wolfbar.org/cerridwyn1st/Thierry\'spaintchart.htm